Referencing from SIRIM & Suruhanjaya Tenaga's guidelines, make sure that your water heater installer:
- DO NOT USE under-spec cables | usage of cables thinner than 2.5mm diameter is strictly prohibited & might burn / catch fire (Suruhanjaya Tenaga's stated guideline is 4mm diameter), and
- DO NOT USE plug + socket to connect your water heater to the power source | they are not water proof and increase your risk of getting electrocution.

I suggest u to get CENTON SplashProof Water Heater Connector (available via Shopee / Lazada), it's water proof, meant for instant water heater, and comes with a 1 meter 4mm diameter cable (what's more its from Fajar cable, damn good cable brand in Malaysia). It is designed to replaced these houses with plug + socket, so it will fit perfectly with your junction box.

There are also few other brands in the market, some comes without cable as well (cheaper but might as well get the one with proper cable). Just make sure it is SIRIM approved, such as CENTON and STEC.

This post has been edited by Selene Yeo: Aug 21 2023, 09:47 PM

I extracted this from Suruhanjaya Tenaga's guidebook. Hope this helps u all.



1.5mm diameter is definitely a no (those are meant for maybe lightings), while most older houses in Malaysia are still using 2.5mm diameter (if I am not mistaken for 4kW instant water heater and below long time ago Suruhanjaya Tenaga mentioned 2.5mm diameter is sufficient enough, but then upgraded their recommendation to 4.0mm diameter just to be extra safe).




Here is also the CENTON SplashProof Connector for Instant Water Heater I am talking about, extracted from CENTON's FB page. Also comes with a 1 meter 4mm diameter Fajar cable. I highly recommend this, especially for those who is still using 3-pin plugs in their bathrooms and risking their lives

Also make sure that the storage water heater is being installed with:
a. 2 Isolation Barriers (at water inlet and outlet) - to prevent electrocution
b. Pressure Relief Valve (at water inlet) - to prevent storage tank from being over-pressured (which might cause it to rupture / leak), and to facilitate water drainage during servicing

If I am not mistaken, this will be a compulsory requirement set by SIRIM and Suruhanjaya Tenaga for all SIRIM-approved brands to be pre-installed with these 2 items soon.

By far, storage water heaters market leaders like CENTON and JOVEN already followed this ruling. But just double check during your installation and make sure these 2 items are being fitted, just in case the brand u have bought doesn't have them.